Though I spend the vast majority of my time at Raising Aces immersed in the analysis of pitching mechanics, the best part of the game is the filthy stuff produced by the mechanical process. One of my favorite features at BP is Sam Miller's “The Best Pitches Thrown This Week,” in which the audience is inundated with GIFs of the nastiest projectiles caught on camera. Inspired by Sam's work, in conjunction with our human compulsion toward dicing the season into manageable chunks of information for the sake of over-analysis, I decided to conjure up a collection of the best stuff from the first quartile of the 2013 season.

The categories were chosen to reflect the elements of a well-rounded repertoire, with the data split into fastballs, breaking balls, and off-speed pitches. In appreciation of the qualitative value of elite pitching, both subjective and objective elements were considered when constructing the following lists, yet the end results were too close to call. I plead the audience to help me fill the gaps by voting for their favorite candidate in each pitch-type category and submitting votes in the comments section. [Stats through games of 5/15]

Much of statistical analysis in baseball involves the study of outcomes. Hits, walks, strikeouts—these are the results of what an athlete accomplishes on the field. The focus of scouting and coaching, by contrast, is on process.

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The pitching delivery has evolved throughout the history of Major League Baseball. There are elements of old-school pitching mechanics that are now artifacts of a bygone era, and though one would expect the modern iteration of pitching instruction to have greatly progressed over time, there are some ways in which the pitchers of today have regressed compared to their predecessors. A few of these topics have been covered in previous editions of Raising Aces, such as the modern-day emphasis on angles and deception that has resulted in over-the-top arm slots and closed stride patterns.

The windup is a fundamental component of the pitching delivery, one so basic that its utility in the game is never questioned, yet it serves as a classic example of the ever-changing practices of the pitching-industrial complex. Pitcher windups have morphed over the past 70 years, and what was once a series of movements has been simplified to the current model, which basically involves a side-step and pivot, essentially putting the pitcher in the stretch position at the time that he initiates the lift phase of his motion.

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One of the biggest stories of the first month of the 2013 season has been the incredible turnaround of the Boston Red Sox. The team went from a near-lock for the postseason in September of 2011 to the victims of one of history's greatest collapses, and the disaster carried over to 2012. The Sox were a .500 team in April of last season, and were still three games over at the end of June. However, Boston would go 28-56 over the rest of the campaign, winning just one-third of their remaining games in a brutal crash that was catalyzed by bad blood in the clubhouse and the fire sale of August 25th, in which the Red Sox flipped a quarter-billion dollars worth of contracts in a salary-dump that sent Adrian Gonzalez, Carl Crawford, and Josh Beckett to Los Angeles.

General Manager Ben Cherington made a splash in free agency, signing a handful of players to revamp the roster, but the general outlook for this season was bleak. Preseason predictions by the BP staff placed Boston fourth in the AL East this year, but the team and the city have become a symbol for triumph in the wake of tragedy. Going into play on Tuesday, the Sox have the best record in the game at 18-7, and their run differential of +40 also leads the majors.

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Midwest baseball fans were treated to an NL Central showdown on Wednesday, as the Cubs and the Reds squared off at Great American Ballpark with their aces on the mound. Mat Latos has been a reliable top-of-the-rotation arm for the Reds ever since his arrival via trade with the Padres in the offseason of 2011-12, and he has assumed the top spot in the Cincy rotation with Johnny Cueto currently on the shelf. The Cubbies countered with Jeff Samardzija, whose 2012 breakout has carried over to this season and who entered Wednesday's contest with the third-highest strikeout percentage in the National League (among starting pitchers).

The pitching prodigies did not disappoint. After a 90-minute rain delay, the two right-handers traded scoreless frames until the Reds broke through with a solo homer by Todd Frazier in the bottom of the sixth. When the dust cleared on the duel, that lone run would stand as the difference in a 1-0 Reds victory. Both players performed exceedingly well, yet a very different approach was at the foundation of each pitcher's success.

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Bryce Harper's supernatural baseball gifts have been evident since before he could drive. Today he’s a 20-year-old super-freak who is slugging over .700 in the majors. His rare combination of competitive intensity, Las Vegas moxie, and otherworldly talent has set the stage for a legendary baseball career as the next lightning rod in the game. His raw power grades out as a pure 80 on the scouting ledger, and though such elite marks are extraordinarily rare, the legit five-tool player also has a throwing arm that ranks at the top of the 20-80 scale.

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The ingredients of success for a Major League Baseball team are rooted in scouting and player development, where carefully-crafted strategies dictate the growth patterns of in-house talent. Converting draft picks into major-league production is the engine of a successful franchise in today's game, and the pressure to develop players through the organizational pipeline has intensified due to the league-wide trend for teams to lock down homegrown talent for the long term.

The new-age baseball market features a thin free agent pool, which places additional emphasis on player evaluation, as teams assess trade targets and identify the select free agents whose flaws are perceived to be correctable. Pitching mechanics can play a major role in a team's approach to the acquisition and development of players, whether through the draft, free agency, or trade. As we saw in last month's breakdown of the mechanical trends of the Rays and Brewers, the on-field habits of a big-league staff can provide a window through which to glimpse an organizational approach to pitching.

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A number of rookie pitchers toed the rubber last weekend. Trevor Bauer continued his personal battles with mechanical consistency  on his way to walking seven Rays (including the first four he faced), while Julio Teheran continued to struggle with his curveball. Shelby Miller had a successful introduction to 2013, building on his excellent showing down the stretch last season, though his heavy reliance on the fastball raises familiar questions as he gets deep into games.

The aforementioned pitchers had each entered spring training with a chance to win a spot in the rotation for their respective reams, and each player had already been exposed to the bright lights of the majors, but the most impressive rookie on display last weekend was a 20-year-old with zero experience above high-A who shocked the baseball world with his massive leap to the majors. Jose Fernandez made his major-league debut for the Marlins on Sunday, pitching in Miami less than two years after he had been selected in the first round of the 2011 draft out of a Florida high school. Fernandez stepped onto the field as the second-youngest player in a major-league uniform (that Bryce Harper guy is younger).

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Results in the first week of the season can be volatile, especially on the mound, where many pitchers are still getting themselves into game shape. It is common to see velocities that are lower than peak, a higher frequency of mistimed deliveries, and strict pitch-count limitations as teams ease their aces into the new season.

This opening week was gratifying for those fantasy managers who invested in top-tier pitching on draft day, with a plethora of shutdown performances coming from the top-ranked players on the mound. The near-perfection of Yu Darvish was expertly covered by the Baseball Prospectus team earlier this week, and though his stat line was certainly aided by his facing the American League's weakest lineup, the performance was a positive indicator that Darvish's late-season success of 2012 will carry over into this season. 

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One of the coolest parts of this job is the interaction with the readers of Baseball Prospectus, who consistently drive the discussion with in-depth questions and insightful observations. Half of my articles have been inspired by reader comments, and I greatly appreciate the creative spark provided by the BP audience. One of the most frequent questions that I receive relates to good pitchers with poor mechanics, and though a basic tenet of pitching is that the best pitchers have excellent mechanics, occasionally there are players who find success in spite of an inefficient delivery.

When a top-flight pitcher has a major flaw in his delivery, the player typically compensates for the deficiency with plus grades elsewhere on his mechanics report card. For example, a pitcher with heavy torque might struggle to maintain posture during the high-energy phases of the delivery, and the extra zip that results on his fastball can serve to cover for the corresponding shortcoming in pitch command. Occasionally, a pitcher will find success despite a laundry list of mechanical flaws, but these pitchers are fighting an uphill battle to succeed at the highest level of competition.

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As a die-hard fantasy baseball fanatic, I am aware of the pressing decisions to be made over the next two weekends. I have been playing in a trio of leagues with my college buds that extend back over a decade, including keeper leagues in AL- and NL-only as well as mixed-league formats, and our two most critical drafts are this Sunday. At the risk of salting my own game in the event that my league-mates are reading this article, I want to address an issue that can make a big difference on draft day: pitcher blow-ups.

Paul Sporer and I discussed these players during Part Two of the Towers of Power podcast on pitchers last week, referring to them as “grenades” who can blow up a good month's worth of ratios with a single disaster start. The podcast generated a bunch of questions about the grenade concept, and I was inspired to cover it in more detail by reader C.C.:

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I wrote an article last September in which I detailed the surprising pitching of the Oakland Athletics. The piece included a breakdown of four different A's pitchers, and I noted that many of the players shared specific similarities which reflected an organizational trend toward mechanical efficiency. The A's have a long history of successful pitching development, and the team's mechanical points of emphasis were apparent by looking at the tendencies of the players whom they had developed and/or acquired over the years.

I spent much of the offseason poring over pitcher mechanics and preparing over 100 mechanical report cards for the pitchers in the 2013 Starting Pitcher Guide in my first year working with Paul Sporer on his annual project. I had already watched the majority of these pitchers in the past, spread out over months or sometimes years, but the examination of so many pitchers over such a short timeframe revealed a number of other patterns that cropped up with pitchers from certain organizations.

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